Results 251 to 260 of about 63,330 (315)

AFT FAN DUCT ACOUSTIC RADIATION

Journal of Sound and Vibration, 1998
A finite element code has been developed for the prediction of the radiated acoustic field from the aft fan duct of a turbofan engine. The acoustic field is modelled based on the assumption that the steady flow in and around the nacelle is irrotational as is the acoustic perturbation.
W. Eversman, D. Okunbor
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Broadband self-noise from a ducted fan

AIAA Journal, 1998
This paper describes the prediction of broadband self noise from ducted fans. The source mechanism is assumed to be the interaction of the turbulent boundary layer with the trailing edges of the fan blades. The source levels are obtained from the measurements of self noise from isolated blades by Brooks, Pope and Marcolini and these are corrected to ...
Stewart A. L. Glegg, Cyrille Jochault
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Prediction of tonal ducted fan noise

Journal of Sound and Vibration, 2016
Abstract This study introduces an analytical model aiming at predicting the tonal acoustic sources generated and radiated by the rotor–stator interaction in a fan stage. This model is able to cope with complex three-dimensional stator geometries and it fully accounts for cascade effects, characteristic of modern fan stages.
J. de Laborderie, S. Moreau
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Ducted Fan Design Theory

Journal of Applied Mechanics, 1958
Abstract A theory is outlined by means of which it is possible to design ducted fans directly and without having to choose any parameters in an arbitrary fashion. Optimum sizes and fan speeds are theoretically determined. The design of two fans, one having inlet guide vanes and the other of the low slip-stream-rotation type having NPL ...
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Design and optimization of a ducted fan VTOL MAV controlled by Electric Ducted Fans

2019
In October 2013, we presented our ducted fan VTOL MAV prototype, Dulbema (see figure 1), in the Journal of Mechanic Engineering and Automation (JMEA).1 From an aerodynamic study carried out at the Universite Libre de Bruxelles (ULB), in pursuit of the latest Minidrones competition issued by the French Aerospace Lab ONERA, the ULB decided to continue ...
MOAAD, Yacoubi, ALAAEDDINE, Jlassi, JAWAD, Karoun, TARIK, Ben Kirane, LEKMAN, Bekkali, HAMZA, Jhabli, PATRICK, Hendrick   +6 more
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